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Hydrochemistry of Paleogene formation water and its relationship with hydrocarbon migration and accumulation in Wenliu region in Dongpu sag,Bohai Bay Basin
Pages: 449-455
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  hydrochemistry of formation waterhydrocarbon migrationhydrocarbon accumulationWenliu regionDongpu sagBohai Bay Basin;
Abstract: Faults and salts are widely developed in Wenliu region in Dongpu sag ,Bohai Bay Basin .And hydrocarbon mi-gration processes and the contacts between water-,oil and gas are complex .Based on analysis of the current vertical and horizontal hydrochemical distribution of the Paleogene formation water ,this paper determined the origin of formation water by using isotopes of hydrogen and oxygen .Combined with the features of regional tectonics and hydrodynamics ,we also studied the relationship between the hydrochemical property and the accumulation and distribution of hydrocarbon in Wenliu region.Besides,by means of dissecting the typical profiles of Well Wen 218 to Well Wen 245,the coupling rela-tion between hydrochemical characteristic and hydrocarbon migration and accumulation was further analyzed .The analysis of isotopes of hydrogen and oxygen show that the formation water of this region is primarily composed of the connate wa -ter,with paleo-meteoric water permeating only in some local areas .This indicates that the sealing conditions area good in the Wenliu region,favorable for hydrocarbon accumulation and preservation .Moreover,the hydrochemistry of this region can be divided into five zones in vertical ,namely diluting zones due to permeating of ( paleo-) meteoric water ,released wa-ter of mudstone compaction and fault communication ,concentration zones due to cross-formational flow and end over flow . In the plane ,the Wendong rolling anticline belt and graben belt are the common areas for the gathering of released water from mudstone compaction and meteoric water .The concentrations of salinity and chloridion gradually increase as a result of the condensation process of cross-formational flow of formation water .The areas with high concentration of salinity and chloridion correlate well to hydrocarbon enrichment areas .In addition,the Wenliu region displays good connectivity of faults,resulting in the vertical hydrocarbon migration being dominant while the lateral migration being subsidiary .
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